Background:
Egypt attempted to colonize the region of southern Sudan by establishing the province of Equatoria in the 1870s. Islamic Mahdist revolutionaries overran the region in 1885, but in 1898 a British force was able to overthrow the Mahdist regime. An Anglo-Egyptian Sudan was established the following year with Equatoria being the southernmost of its eight provinces. The isolated region was largely left to itself over the following decades, but Christian missionaries converted much of the population and facilitated the spread of English. When Sudan gained its independence in 1956, it was with the understanding that the southerners would be able to participate fully in the political system. When the Arab Khartoum government reneged on its promises, a mutiny began that led to two prolonged periods of conflict (1955-1972 and 1983-2005) in which perhaps 2.5 million people died - mostly civilians - due to starvation and drought. Ongoing peace talks finally resulted in a Comprehensive Peace Agreement, signed in January 2005. As part of this agreement the south was granted a six-year period of autonomy to be followed by a referendum on final status. The result of this referendum, held in January 2011, was a vote of 98% in favor of secession. Independence was attained on 9 July 2011. Since independence South Sudan has struggled with good governance and nation building and has attempted to control rebel militia groups operating in its territory. Economic conditions have deteriorated since January 2012 when the government decided to shut down oil production following bilateral disagreements with Sudan.

NOTE: 1) The information regarding South Sudan on this page is re-published from the 2015 World Fact Book of the United States Central Intelligence Agency. No claims are made regarding the accuracy of South Sudan Introduction 2015 information contained here. All suggestions for corrections of any errors about South Sudan Introduction 2015 should be addressed to the CIA.
2) The rank that you see is the CIA reported rank, which may habe the following issues:
a) They assign increasing rank number, alphabetically for countries with the same value of the ranked item, whereas we assign them the same rank.
b) The CIA sometimes assignes counterintuitive ranks. For example, it assigns unemployment rates in increasing order, whereas we rank them in decreasing order